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40.31.9.125.5303 Finder Miniature PCB relay 1pole 10A DC 125V
Finder 40.31.9.125.5303 is a high-temperature wash-tight electromechanical PCB relay with one 12 A normally open AgNi gold-plated contact, a 125 V DC coil and a 5.2 mm pin length.
Why Choose the Finder 40.31.9.125.5303 PCB Relay?
The Finder 40.31.9.125.5303 is a compact and dependable electromechanical PCB relay designed for switching electrical loads in industrial controls, automation equipment and electronic assemblies. As part of the established Finder Series 40 relay range, it combines a high-capacity contact system with a sensitive DC coil and a space-efficient enclosure.
This relay features a single normally open contact for straightforward load switching. Its AgNi contact material with gold plating supports dependable electrical performance, while the RT III wash-tight, high-temperature construction protects the internal mechanism during compatible PCB cleaning processes and permits operation at elevated ambient temperatures.
With a 125 V DC coil, a contact rating of up to 12 A when PCB-mounted and a 5.2 mm pin length, the 40.31.9.125.5303 is suitable for industrial controllers, machinery interfaces and electronic equipment requiring dependable load switching in demanding environments.
Key Advantages
- Compact PCB relay designed for industrial control applications.
- Single normally open contact for straightforward load switching.
- Rated for up to 12 A on a printed circuit board.
- 125 V DC coil suitable for high-voltage DC control circuits.
- AgNi contacts with gold plating support dependable electrical performance.
- RT III wash-tight, high-temperature construction for demanding PCB applications.
Key Features
- Finder Series 40 electromechanical relay.
- 1 NO contact configuration.
- 12 A PCB contact rating and 10 A socket contact rating.
- 125 V DC standard coil with a rated power of 0.65 W.
- AgNi contact material with gold plating.
- 5.2 mm PCB pin length.
- Wash-tight RT III protection category.
- High-temperature version rated for ambient temperatures up to +125 °C.
Reliable Switching for Industrial Control Systems
Electromechanical relays such as the Finder 40.31 provide galvanic separation between a control circuit and the connected load. Applying the rated voltage to the coil closes the normally open contact, allowing machinery, lighting, heating equipment and other electrical loads to be controlled by an automation system.
The Series 40 platform is engineered for PCB and socket applications where compact dimensions, high switching capacity and dependable isolation are required. The gold-plated contact system and wash-tight, high-temperature enclosure make this variant suitable for demanding electronic equipment and industrial control applications.
Typical Applications
- Industrial control panels and automation equipment.
- Programmable controller output interfaces.
- Electronic circuit boards and control modules.
- Heating, ventilation and air-conditioning controls.
- Lighting and building automation systems.
- Equipment operating in elevated-temperature environments.
Technical Specifications
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| Device Type | Plug-in Relay | |
|---|---|---|
| Mounting Type | PCB, Plug-in socket | |
| Load Voltage | 400 V AC | |
| Switching Current (A) | 12 A | |
| Coil / Supply Voltage | 125 V DC | |
| Contacts | 1NO | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.31.9.125.5303 | |
| Product type | Electromechanical PCB relay | |
| Contact configuration | 1 NO | |
| Rated current | 12 A PCB / 10 A socket | |
| Maximum peak current | 20 A | |
| Rated voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| AC1 rated load | 3000 VA | |
| AC15 rated load at 230 V AC | 1000 VA | |
| Single-phase motor rating | 0.55 kW | |
| Coil voltage | 125 V DC | |
| Rated coil power | 0.65 W | |
| Contact material | AgNi with gold plating | |
| Operate / release time | 7 / 3 ms | |
| Mechanical life | 10 million cycles | |
| Electrical life at rated load | 200,000 cycles | |
| Coil-to-contact dielectric strength | 4000 V AC | |
| Open-contact dielectric strength | 1000 V AC | |
| Impulse withstand voltage | 6 kV | |
| Protection category | RT III wash-tight | |
| Mounting type | Through-hole PCB mounting / compatible relay socket | |
| Pin length | 5.2 mm | |
| Ambient temperature range | −40 to +125 °C |
Frequently Asked Questions
What is the Finder 40.31.9.125.5303 used for?
This relay switches electrical loads in industrial controls, automation equipment, electronic assemblies and equipment operating in elevated-temperature environments.
What contact configuration does this relay have?
The 40.31.9.125.5303 has a single normally open contact.
What coil voltage does the relay require?
This relay is designed for a nominal 125 V DC coil supply.
What current can the relay switch?
The relay is rated for up to 12 A when mounted directly on a PCB or 10 A when used with a compatible socket.
Is the Finder 40.31.9.125.5303 suitable for high-temperature applications?
Yes. This wash-tight RT III variant is specified for ambient temperatures up to +125 °C.
Trusted for Industrial Switching Worldwide
Finder Series 40 relays are widely used by control-panel builders, automation engineers and equipment manufacturers for dependable switching, robust electrical isolation and flexible PCB or socket installation.
